261955408713 has 16 divisors (see below), whose sum is σ = 369837046656. Its totient is φ = 164356335360.

The previous prime is 261955408703. The next prime is 261955408717. The reversal of 261955408713 is 317804559162.

It is not a de Polignac number, because 261955408713 - 2⁹ = 261955408201 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is not an unprimeable number, because it can be changed into a prime (261955408717) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1069323 + ... + 1291263.

It is an arithmetic number, because the mean of its divisors is an integer number (23114815416).

It is a 2-persistent number, because it is pandigital, and so is 2⋅261955408713 = 523910817426, but 3⋅261955408713 = 785866226139 is not.

Almost surely, 2^261955408713 is an apocalyptic number.

It is an amenable number.

261955408713 is a deficient number, since it is larger than the sum of its proper divisors (107881637943).

261955408713 is a wasteful number, since it uses less digits than its factorization.

261955408713 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245104.

The product of its (nonzero) digits is 1814400, while the sum is 51.

The spelling of 261955408713 in words is "two hundred sixty-one billion, nine hundred fifty-five million, four hundred eight thousand, seven hundred thirteen".